Random Email Batch Generator

Generate 50 test emails for @my-test-shop.com at once—just drag a slider and click Generate.

The Random Email Batch Generator is a tool that automatically produces virtual email addresses according to rules you set. It runs entirely locally in your browser, connects to no mail servers, and leaves no traces of real accounts. Its core features are: auto-generate the local part, you control the domain, and generate entire batches at once. Whether you're a developer writing unit tests for registration flows, a trainer preparing practice accounts, or a regular user wanting to protect your real email while filling a form temporarily, this tool quickly generates a set of RFC-compliant email addresses with no actual mail-receiving capability.

Usage Steps

Set the generation quantity: Drag the slider at the top of the screen, or enter an integer between 1 and 100 directly in the number field next to it. Larger quantities take slightly longer to generate, but usually complete within a few hundred milliseconds.
Enter a custom domain: In the input field labeled "example.com", delete the sample text and enter the domain you want to use, such as myapp-test.net. Do not include http:// or www. in the domain—just the plain domain format like example.com.
Adjust the prefix length range: Two slider pairs control the minimum and maximum length of the local part (the username before the @), with a range of 1 to 30. If you set the minimum length to 5 and maximum to 9, generated usernames will be between 5 and 9 characters.
Choose the prefix type: Three modes are available: "Letters only", "Numbers only", and "Mixed". Selecting "Mixed" makes the local part contain both lowercase letters and numbers.
Click the "Generate" button: A batch of email addresses appears instantly in the preview area on the right. If you want to generate up to the current maximum quantity at once, you can click the "Batch Generate" button, which will produce as many as your current limit allows.
Copy the results: Drag to select or click the copy button to put all email addresses in your clipboard, then paste directly into your test spreadsheet or script.

Complete Example

Suppose you need 8 test emails with the domain shop-test.cn for load testing an e-commerce backend, with local name length controlled between 6 and 10 characters, using "Mixed" style.

Steps: Drag the quantity slider to 8; enter shop-test.cn in the domain field; set the prefix minimum length slider to 6 and maximum to 10; select "Mixed" for the prefix type; click "Generate".

You might get a batch of addresses like this on the right:

k9m3xq@shop-test.cn
7tw02a@shop-test.cn
b5y8n1r@shop-test.cn
n0p4v2@shop-test.cn
g3h6s9u@shop-test.cn
q2e8w5@shop-test.cn
f1j4z7l@shop-test.cn
c6y0d8@shop-test.cn

Each address complies with RFC 5322 email format standards, so entering it into a registration form's "Email" field won't produce a format error. However, there is no real mail server behind them, so you cannot use these addresses to receive verification codes or reset passwords.

More Scenarios and Examples

Minimizing the local name: Set both prefix minimum and maximum length to 1, select "Letters only" for the type, change the domain to a.co, and set the quantity to 3. After generating, you'll see single-letter addresses like x@a.co, j@a.co, and l@a.co on the right. These ultra-short addresses are useful for format boundary testing, such as checking whether frontend validation accepts a single-character local part.

Large batches with numeric prefixes: If you need many unique numeric account names, switch the type to "Numbers only", increase the quantity to 80, set the domain to data-test.org, and use length 8–12. Click "Batch Generate" to get a long list of addresses like 28401736@data-test.org in seconds, each meeting length requirements and very likely unique.

Comparison with real testing: If you have a real corporate email domain on hand and need backend validation coordination, you can use these generated addresses to register in an internal test system—as long as that system doesn't require email verification. If actual mail receipt is needed, you should create real accounts from an administrator instead of using this tool.

How to Use and Interpret Results

Each line you get is a complete, well-formed email string. It can be used in:

Registration form testing: Fill it into a username field to see if frontend validation passes.
Database load testing: Bulk-insert 100 unique emails to verify unique constraints and character set compatibility.
Teaching and demonstrations: Use as sample data in Excel or Python data-processing examples, representing a real email column.
Privacy protection: When an untrustworthy website requires an email just to browse, use this instead of your real address.

What you cannot do: Receive activation links, reset passwords, or send bulk emails. There is no mail server behind any of these addresses—any email sent to them will bounce or be lost forever.

The length and type of the local part directly affect how realistic the generated results appear. A letters-only local part resembles real name abbreviations, while mixed and numbers-only styles look like system-generated accounts. You can switch styles based on the registration platform you're simulating.

Common Misuses and Pitfalls

Entering a domain as a URL: Typing https://myapp.com or www.myapp.com produces invalid addresses like abc@https://myapp.com. The domain field accepts only plain domains like example.com.
Using generated emails to receive mail in production workflows: Many teams fill test data and forget these emails cannot receive mail, then trigger bulk sends that result in massive bounces, damaging your mail service's reputation.
Using results to register important personal accounts: If you bind an account to an email with no real mail capability, you will have no way to reset your password if lost—essentially losing that account forever.
Assuming bulk generation is absolutely non-repetitive: The algorithm spreads characters widely, but at very small lengths (1–2 characters) and quantities near the combinatorial limit, repetition is possible. If strict uniqueness matters, deduplicate results after generation or use larger length ranges.
Relying on history to persist: The preview area retains a few recent records, but history disappears after page refresh or browser cache clearing. Copy important results to a document or spreadsheet immediately.

Boundaries and Important Notes

This tool generates local parts composed only of lowercase letters and numbers—it does not include dots, underscores, plus signs, or other special characters. It also does not support internationalized domain names or email addresses containing Chinese characters. If you need to test validation for special characters, you must construct those addresses manually.

The batch generation limit per run is 100 addresses; larger quantities require multiple generations. Generation speed depends on your device performance and browser. Generating 100 addresses simultaneously on mobile might take several seconds—this is normal.

The tool sends no requests to any server; all random character concatenation and list rendering happen locally. Therefore, it cannot verify whether a domain you enter actually exists—if you enter a non-existent domain like gsdhsakd.cn, the tool will generate normally, and the resulting addresses still cannot receive mail, but their format remains valid.

Generated results are for testing, learning, and one-time registrations only—they cannot replace a real, working email service. Since randomly generated addresses have an extremely low chance of colliding with real ones, never use them to send harassment mail or conduct any improper operations.

Frequently Asked Questions

Can generated emails receive verification codes?
No. These addresses have no corresponding mail server, so any email sent to them will bounce or be lost. Real emails are required to receive verification codes.

Can I generate multiple different domains at once?
Currently, only one domain per generation. If you need multiple domains, generate multiple times, changing the domain field each time and clicking Generate.

Why does bulk generating 100 addresses lag slightly?
It must complete 100 string concatenations and render them all at once. On newer computers this usually completes instantly, but older phones or legacy browsers may pause briefly—this is browser resource scheduling, not a malfunction.

How long is generation history retained?
History is stored in the current page session and clears automatically when you close the tab or refresh. If results are important, copy them to a document or spreadsheet immediately after generation.

Can the local part include dots or uppercase letters?
Currently the local part uses only lowercase letters and numbers (depending on your chosen type). If you need uppercase or special characters, you can generate first, then manually edit the results.

Does this tool require an internet connection?
Not at all. After the page loads, generation, batch, and copy functions work normally even offline.

Now you can drag the sliders above, enter your own domain, click Generate, and instantly get a set of test emails.